CN110813504A - Blast furnace coal injection and pulverization system with drying furnace removed and working method thereof - Google Patents
Blast furnace coal injection and pulverization system with drying furnace removed and working method thereof Download PDFInfo
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- CN110813504A CN110813504A CN201911268004.7A CN201911268004A CN110813504A CN 110813504 A CN110813504 A CN 110813504A CN 201911268004 A CN201911268004 A CN 201911268004A CN 110813504 A CN110813504 A CN 110813504A
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- 239000003245 coal Substances 0.000 title claims abstract description 160
- 238000001035 drying Methods 0.000 title claims abstract description 61
- 238000002347 injection Methods 0.000 title claims abstract description 48
- 239000007924 injection Substances 0.000 title claims abstract description 48
- 238000010298 pulverizing process Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000002912 waste gas Substances 0.000 claims abstract description 48
- 239000007789 gas Substances 0.000 claims abstract description 41
- 230000001105 regulatory effect Effects 0.000 claims description 28
- 239000004744 fabric Substances 0.000 claims description 20
- 239000003034 coal gas Substances 0.000 claims description 13
- 239000010687 lubricating oil Substances 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000010926 purge Methods 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims 2
- 239000000843 powder Substances 0.000 abstract description 25
- 230000008569 process Effects 0.000 abstract description 10
- 239000000571 coke Substances 0.000 abstract description 7
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 230000002411 adverse Effects 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 13
- 239000003546 flue gas Substances 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000003801 milling Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 3
- 239000010812 mixed waste Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003287 bathing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/02—Feeding devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/08—Screens rotating within their own plane
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
- F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/025—Air heaters with forced circulation using fluid fuel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a blast furnace coal injection and pulverization system for a drying furnace and a working method thereof. According to the blast furnace coal injection and pulverization system with the drying furnace removed, after the drying furnace is removed, the most flammable medium, blast furnace gas and coke oven gas in the coal injection area are eliminated, so that the safety coefficient in the area is improved, and the whole process flow is simplified and efficient due to the fact that the operation of the drying furnace is omitted. And the adverse factors that ultrahigh-temperature gas enters the powder making system when the control of the drying furnace is abnormal are avoided by completely using the waste gas of the hot blast stove as the drying gas. The coal injection system is designed for removing the drying furnace, so that the investment cost of the drying furnace is saved.
Description
Technical Field
The invention belongs to the field of coal injection and pulverization, and particularly relates to a blast furnace coal injection and pulverization system with a drying furnace removed. The invention also relates to a working method of the blast furnace coal injection and pulverization system without the drying furnace.
Background
The blast furnace coal powder injection is an important energy-saving technology for changing the blast furnace fuel structure and realizing the replacement of coke by coal in the blast furnace iron-making process, plays an important role in reducing the cost of iron per ton, relieving the shortage of coking coal resources and reducing the environmental pollution, and has remarkable economic, environmental-friendly and social benefits.
At present, a drying furnace system is uniformly adopted in the design of a domestic blast furnace coal injection system, and the drying furnace system is mixed with waste gas after heat exchange of a blast furnace hot blast stove and used as a drying high-temperature waste gas source of a powder making system. And the whole exhaust gas temperature is regulated by using the high-temperature exhaust gas of the drying furnace. The mixed waste gas is used as a drying and conveying carrier of raw coal of a pulverizing system, gas-powder separation is carried out on the raw coal to a cloth bag box body, and the separated clean gas is discharged into the atmosphere through a main exhaust fan.
At present, blast furnace iron making uses a coal injection system to reduce fuel cost, and the coal injection system uses flue gas for drying and carrying in the process of grinding raw coal into powder, which is a current general process form. The flue gas used for milling comes from two aspects, namely the waste gas generated by burning the blast furnace hot blast stove, and the mixed waste gas formed by mixing the high-temperature flue gas generated by burning blast furnace gas in the self-built drying furnace for milling. The coal injection area is also determined as a first-level fireproof area because the coal injection area has various dangers due to the existence of combustible coal powder, blast furnace gas and coke oven gas, the leakage of the coal powder and the coal gas in the production process becomes a serious unsafe factor and influences the production safety of the whole area.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide a blast furnace coal injection and milling system for removing a drying furnace, which solves the problems that the conventional blast furnace coal injection and milling system adopts the drying furnace, the existing drying furnace has combustible coal powder, blast furnace gas and coke oven gas, the safety production of the whole area is not favorable, the leakage of the coal powder and the coal gas in the production process becomes serious unsafe factors, the production safety of the whole area is influenced, and the production and the manufacture of enterprises are not favorable. The invention also provides a working method of the blast furnace coal injection and pulverization system for removing the drying furnace, the working principle is simple and feasible, the potential harm in the production process of enterprises is reduced, the safety is improved, and the method is suitable for industrial large-scale application.
The technical scheme is as follows: the utility model provides a get rid of blast furnace coal injection pulverizing system of drying furnace, includes buggy storehouse, shale shaker, batcher, storehouse top dust remover, sack collector, raw coal storehouse, coal feeder, medium speed pulverizer, hot-blast draught fan one, chimney and hot-blast furnace system, a branch of hot-blast furnace system passes through the valve and the pipeline is connected with the chimney to another branch of hot-blast furnace system is connected with the medium speed pulverizer through hot-blast draught fan one, valve and pipeline, raw coal storehouse passes through the coal feeder and is connected with the feed inlet of medium speed pulverizer, the discharge gate and the sack collector of medium speed pulverizer are connected, the sack collector is connected with the batcher, the batcher passes through the shale shaker and is connected with the buggy storehouse, the storehouse top dust remover sets up on the buggy storehouse. According to the blast furnace coal injection and pulverization system with the drying furnace removed, after the drying furnace is removed, the most flammable medium, blast furnace gas and coke oven gas in the coal injection area are eliminated, so that the safety coefficient in the area is improved, and the whole process flow is simplified and efficient due to the fact that the operation of the drying furnace is omitted. And the adverse factors that ultrahigh-temperature gas enters the powder making system when the control of the drying furnace is abnormal are avoided by completely using the waste gas of the hot blast stove as the drying gas. The coal injection system is designed for removing the drying furnace, so that the investment cost of the drying furnace is saved.
Further, foretell get rid of blast furnace coal injection powder process system of drying furnace, the hot-blast furnace system comprises a set of hot-blast furnace, be equipped with air regulating valve, hot-blast valve, air combustion valve, flue valve one, pressure charging valve, cold-blast valve one, waste gas valve, flue valve, gas control valve and gas purge valve on the hot-blast furnace, gas control valve is connected to same gas piping, air regulating valve is connected to same air piping, the hot-blast valve is connected to same hot-blast pipe to the hot-blast pipe that the hot-blast valve is connected with the blast furnace, cold-blast valve one is connected to same cold-blast pipe.
Further, in the blast furnace coal injection and pulverization system for removing the drying furnace, a flue gas bypass valve and a flue gas heat exchanger are arranged between the hot blast furnace system and the chimney.
Further, foretell get rid of blast furnace coal injection powder process system of drying furnace, be equipped with high temperature waste gas governing valve, hot-blast waste gas trip valve and hot-blast waste gas governing valve between hot-blast furnace system and the hot-blast draught fan one.
Furthermore, in the blast furnace coal injection and pulverization system for removing the drying furnace, a flue valve II, a tail gas recirculation valve and a cold air valve II are arranged between the hot air induced draft fan I and the medium-speed coal mill.
Furthermore, foretell get rid of blast furnace coal injection pulverizing system of drying furnace, be connected with coal pulverizer lubricating oil pump, coal pulverizer sealing fan and coal pulverizer motor on the medium speed coal pulverizer, coal pulverizer lubricating oil pump is connected with the coal pulverizer lubricating oil station.
Further, in the above blast furnace coal injection and pulverization system for removing the drying furnace, the bag collector is provided with the main exhaust fan.
Further, in the above blast furnace coal injection and pulverization system without the drying furnace, a coal feeder inlet valve is arranged between the raw coal bunker and the coal feeder.
The invention relates to a working method of a blast furnace coal injection and pulverization system for removing a drying furnace, which comprises the following steps:
1) starting the vibrating screen, the feeder and the cloth bag collector;
2) starting a lubricating oil pump of the coal mill and a sealing fan of the coal mill, and opening a second flue valve;
3) starting a main exhaust fan, and generating negative pressure in the whole pulverizing system;
4) starting a group of hot blast stoves, enabling coal gas to pass through a coal gas regulating valve, enabling air to pass through an air regulating valve, and respectively flushing cold air into the hot blast stoves through a cold air valve;
5) the hot blast stove works, and hot blast produced by the hot blast stove is sent into a blast furnace;
6) the waste gas generated by the hot blast stove is fed into the medium-speed coal mill through a waste gas valve under the action of a hot air induced draft fan I;
7) when the outlet of the bag collector reaches the temperature, starting a medium-speed coal mill, opening an inlet valve of a coal feeder, and feeding coal to the coal feeder by a designed amount of 25%;
8) opening a high-temperature waste gas regulating valve, and regulating the inlet temperature of the medium-speed coal mill to a specified value of 260 ℃;
9) the coal powder of the medium-speed coal mill enters the cloth bag collector under the action of the main exhaust fan, is vibrated and shaken by bag pulse of the cloth bag collector and falls into the ash bin, reaches the vibrating screen through the feeder, and enters the coal powder bin after impurities are removed through the screen.
The technical scheme shows that the invention has the following beneficial effects: according to the blast furnace coal injection and pulverization system with the drying furnace removed, the danger source, the blast furnace gas and the coke oven gas in the whole coal injection area are removed synchronously by removing the drying furnace system. The whole investment cost of the dry bathing furnace is saved from the design scheme of the system, and the use of the coke oven gas which is usually open fire in the system is saved. The blast furnace gas burnt by the original system is not used any more and is used for burning the hot blast stove.
Because the whole drying furnace system is removed, the investment cost of the whole coal injection system is greatly reduced in the design scheme, and the cost of the whole drying furnace system accounts for 10-12% of the whole investment cost.
The whole pulverizing system for removing the drying furnace system becomes safer, and the operation control is more concise.
Drawings
FIG. 1 is a schematic diagram of a blast furnace coal injection and pulverizing system with a drying furnace removed according to the present invention;
fig. 2 is a schematic diagram of a hot blast stove system according to the present invention.
In the figure: the device comprises a pulverized coal bunker 1, a vibrating screen 2, a feeder 3, a bunker top dust remover 4, a cloth bag collector 5, a raw coal bunker 6, a coal feeder 7, a medium-speed coal mill 8, a hot air induced draft fan I9, a chimney 11, a hot air furnace system 12, a hot air furnace 13, an air regulating valve 14, a hot air valve 15, an air combustion valve 16, a flue valve I17, a charging valve 18, a cold air valve I19, a waste gas valve 20, a flue valve 21, a coal gas regulating valve 22, a coal gas purging valve 23, a flue gas bypass valve 24, a flue gas heat exchanger 25, a high-temperature waste gas regulating valve 26, a hot air waste gas cut-off valve 27, a hot air waste gas regulating valve 28, a flue valve II 29, a tail gas recirculation valve 30, a cold air valve II 31, a coal mill lubricating oil pump 32, a coal mill sealing fan 33, a coal.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Examples
The blast furnace coal injection and pulverizing system for removing the drying furnace as shown in fig. 1 and 2 comprises a pulverized coal bunker 1, a vibrating screen 2, a feeder 3, a bunker top dust remover 4, a cloth bag collector 5, a raw coal bunker 6, a coal feeder 7, a medium-speed coal mill 8, a hot air induced draft fan I9, a chimney 11 and a hot air furnace system 12, wherein one branch of the hot air furnace system 12 is connected with the chimney 11 through a valve and a pipeline, the other branch of the hot air furnace system 12 is connected with the medium-speed coal mill 8 through the hot air induced draft fan I9, a valve and a pipeline, the raw coal bunker 6 is connected with a feed inlet of the medium-speed coal mill 8 through the coal feeder 7, a discharge port of the medium-speed coal mill 8 is connected with the cloth bag collector 5, the cloth bag collector 5 is connected with the feeder 3, the feeder 3 is connected with the pulverized coal bunker 1 through the vibrating screen 2, and the. The hot blast stove system 12 is composed of a group of hot blast stoves 13, the hot blast stove 13 is provided with an air regulating valve 14, a hot blast valve 15, an air combustion valve 16, a flue valve 17, a pressure charging valve 18, a cold blast valve 19, a waste gas valve 20, a flue valve 21, a gas regulating valve 22 and a gas purging valve 23, the gas regulating valve 22 is connected to the same gas pipeline, the air regulating valve 14 is connected to the same air pipeline, the hot blast valve 15 is connected to the same hot blast pipeline, the hot blast pipeline connected with the hot blast stove 15 is connected with the blast furnace, and the cold blast valve 19 is connected to the same cold blast pipeline. A flue gas bypass valve 24 and a flue gas heat exchanger 25 are arranged between the hot blast stove system 12 and the chimney 11. And a high-temperature waste gas regulating valve 26, a hot air waste gas cut-off valve 27 and a hot air waste gas regulating valve 28 are arranged between the hot blast stove system 12 and the first hot air induced draft fan 9. After entering the coal mill, the hot air exhaust gas has two functions, namely, corresponding heat is brought in to dry raw coal; and secondly, as a conveying medium of the coal grinding system, conveying pulverized coal into a bag box for gas-powder separation, and discharging the qualified exhaust gas after separation into the atmosphere through a chimney after passing through a main exhaust fan. The separated finished coal powder is vibrated and shaken off into an ash bin by the pulse impact of the cloth bag, reaches a vibrating screen through a feeder, is screened to remove impurities, then enters the coal powder bin, and is stored for blast furnace injection. And a flue valve II 29, a tail gas recirculation valve 30 and a cold air valve II 31 are arranged between the hot air induced draft fan I9 and the medium-speed coal mill 8. And a coal mill lubricating oil pump 32, a coal mill sealing fan 33 and a coal mill motor 34 are connected to the medium-speed coal mill 8, and the coal mill lubricating oil pump 32 is connected with a coal mill lubricating oil station 35. The bag collector 5 is provided with a main exhaust fan 36. The main exhaust fan 36 is started by the coal pulverizing system, negative pressure is generated by the whole coal pulverizing system, the waste gas induced fan introduces waste flue gas generated by heat exchange of the hot blast stove into a mixing chamber of the drying furnace, the waste flue gas is mixed with high-temperature flue gas generated by the drying furnace to reach a set temperature, and the mixed flue gas enters the coal mill to dry raw coal. A feeder inlet valve 37 is arranged between the raw coal bin 6 and the feeder 7.
Based on the structure, the working method of the blast furnace coal injection and pulverization system for removing the drying furnace comprises the following steps:
1) starting the vibrating screen 2, the feeder 3 and the cloth bag collector 5;
2) starting a coal mill lubricating oil pump 32 and a coal mill sealing fan 33, and opening a second flue valve 29;
3) the main exhaust fan 36 is started, and the whole pulverizing system generates negative pressure;
4) starting a group of hot blast furnaces 13, wherein coal gas passes through a coal gas regulating valve 22, air passes through an air regulating valve 14, and cold air respectively rushes into the hot blast furnaces 13 through a first cold air valve 19;
5) the hot blast stove 13 works, and hot blast generated by the hot blast stove 13 is sent into the blast furnace;
6) the waste gas generated by the hot blast stove 13 is sent into a medium-speed coal mill 8 through a waste gas valve 20 under the action of a first hot air induced draft fan 9;
7) when the temperature of the outlet of the bag collector 5 reaches the temperature, starting the medium-speed coal mill 8, opening an inlet valve 37 of the coal feeder, and feeding coal to the coal feeder 7 by the designed amount of 25%;
8) opening the high-temperature waste gas regulating valve 26, and regulating the inlet temperature of the medium-speed coal mill 8 to a specified value of 260 ℃;
9) the coal powder of the medium-speed coal mill 8 enters the cloth bag collector 5 under the action of the main exhaust fan 36, is vibrated and shaken by the bag pulse of the cloth bag collector 5 to fall into the ash bin, reaches the vibrating screen 2 through the feeder 3, is screened to remove impurities, and then enters the coal powder bin 1.
The invention adopts a blast furnace coal injection and pulverization system for removing a drying furnace, which comprises the following steps:
1. the drying furnace part in the blast furnace coal injection system is removed from the design;
2. after the drying furnace system is removed, the temperature of the waste gas introduced from the waste gas pipeline of the hot blast stove is 165 ℃ on average, and the waste gas is used as low-temperature waste gas;
3. leading out a waste gas pipeline from the front end of an inlet of a waste gas pipeline heat exchanger of a hot blast stove to supplement high-temperature waste gas of a powder making system, wherein the temperature uniformity of the waste gas before heat exchange is 320-350 ℃;
4. the introduced waste gas pipeline is provided with a regulating valve to control the introduced waste gas amount and regulate the temperature of the mixed waste gas;
5. in the normal production process, the usage amount of waste gas after heat exchange accounts for 75-80%, and the usage amount of waste gas before heat exchange accounts for 20-25%, so that the requirement of powder making production can be met;
6. when the powder process system starts, introduce hot-blast waste gas through the system draught fan, preheat whole powder process system, when system sack outlet temperature rose to 60 ℃, through opening high temperature waste gas governing valve, introduce high temperature waste gas and improve the coal pulverizer entry temperature and carry out normal coal-grinding production.
7. Because the powder process system uses partial waste gas which is not subjected to heat exchange, the gas quantity of the heat exchange is reduced, the waste gas of the hot blast stove is synchronously adjusted to keep higher temperature, and the added coal gas for burning the furnace and the coal gas used by the powder process system are integrally balanced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (9)
1. The utility model provides a get rid of blast furnace coal injection pulverizing system of drying furnace which characterized in that: comprises a pulverized coal bunker (1), a vibrating screen (2), a feeder (3), a bunker top dust remover (4), a cloth bag collector (5), a raw coal bunker (6), a coal feeder (7), a medium-speed coal mill (8), a hot air draught fan I (9), a chimney (11) and a hot air furnace system (12), wherein one branch of the hot air furnace system (12) is connected with the chimney (11) through a valve and a pipeline, the other branch of the hot air furnace system (12) is connected with the medium-speed coal mill (8) through the hot air draught fan I (9), the valve and the pipeline, the raw coal bunker (6) is connected with a feed inlet of the medium-speed coal mill (8) through the coal feeder (7), a discharge outlet of the coal mill (8) is connected with the cloth bag collector (5), the cloth bag collector (5) is connected with the feeder (3), the feeder (3) is connected with the pulverized coal bunker (1) through the vibrating screen (2), the top dust remover (4) is arranged on the pulverized coal bin (1).
2. The system of claim 1, wherein the drying furnace is removed from the blast furnace coal injection and pulverization system, and the system comprises: the hot blast stove system (12) comprises a set of hot blast stove (13), be equipped with air control valve (14), hot-blast valve (15), air combustion valve (16), flue valve (17), pressure charging valve (18), cold blast valve (19), waste gas valve (20), flue valve (21), gas control valve (22) and coal gas purge valve (23) on hot blast stove (13), gas control valve (22) are connected to same gas pipeline, air control valve (14) are connected to same air conduit, hot blast valve (15) are connected to same hot-blast main to the hot-blast main that hot blast valve (15) are connected is connected with the blast furnace, cold blast valve (19) are connected to same cold blast main.
3. The system of claim 1, wherein the drying furnace is removed from the blast furnace coal injection and pulverization system, and the system comprises: a smoke bypass valve (24) and a smoke heat exchanger (25) are arranged between the hot blast stove system (12) and the chimney (11).
4. The system of claim 1, wherein the drying furnace is removed from the blast furnace coal injection and pulverization system, and the system comprises: and a high-temperature waste gas regulating valve (26), a hot air waste gas cut-off valve (27) and a hot air waste gas regulating valve (28) are arranged between the hot air furnace system (12) and the first hot air induced draft fan (9).
5. The system of claim 1, wherein the drying furnace is removed from the blast furnace coal injection and pulverization system, and the system comprises: and a second flue valve (29), a tail gas recirculation valve (30) and a second cold air valve (31) are arranged between the first hot air induced draft fan (9) and the medium-speed coal mill (8).
6. The system of claim 1, wherein the drying furnace is removed from the blast furnace coal injection and pulverization system, and the system comprises: and a coal mill lubricating oil pump (32), a coal mill sealing fan (33) and a coal mill motor (34) are connected to the medium-speed coal mill (8), and the coal mill lubricating oil pump (32) is connected with a coal mill lubricating oil station (35).
7. The system of claim 1, wherein the drying furnace is removed from the blast furnace coal injection and pulverization system, and the system comprises: and a main exhaust fan (36) is arranged on the cloth bag collector (5).
8. The system of claim 1, wherein the drying furnace is removed from the blast furnace coal injection and pulverization system, and the system comprises: and a coal feeder inlet valve (37) is arranged between the raw coal bin (6) and the coal feeder (7).
9. A working method of a blast furnace coal injection and pulverization system for removing a drying furnace is characterized by comprising the following steps: the method comprises the following steps:
1) starting the vibrating screen (2), the feeder (3) and the cloth bag collector (5);
2) starting a coal mill lubricating oil pump (32) and a coal mill sealing fan (33), and opening a second flue valve (29);
3) starting a main exhaust fan (36), and generating negative pressure in the whole pulverizing system;
4) starting a group of hot blast stoves (13), wherein coal gas passes through a coal gas regulating valve (22), air passes through an air regulating valve (14), and cold air respectively flushes into the hot blast stoves (13) through a cold air valve I (19);
5) the hot blast stove (13) works, and hot blast generated by the hot blast stove (13) is sent into the blast furnace;
6) waste gas generated by the hot blast stove (13) is sent into a medium-speed coal mill (8) through a waste gas valve (20) under the action of a first hot air induced draft fan (9);
7) when the temperature of the outlet of the cloth bag collector (5) reaches the temperature, starting a medium-speed coal mill (8), opening an inlet valve (37) of a coal feeder, and feeding coal to the coal feeder (7) by a designed amount of 25%;
8) opening a high-temperature waste gas regulating valve (26), and regulating the inlet temperature of the medium-speed coal mill (8) to a specified value of 260 ℃;
9) the pulverized coal of the medium-speed coal mill (8) enters the cloth bag collector (5) under the action of the main exhaust fan (36), is vibrated and shaken into the ash bin by the bag pulse impact of the cloth bag collector (5), reaches the vibrating screen (2) through the feeding machine (3), removes impurities through the screen, and then enters the pulverized coal bin (1).
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| CN201911268004.7A CN110813504A (en) | 2019-12-11 | 2019-12-11 | Blast furnace coal injection and pulverization system with drying furnace removed and working method thereof |
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| CN201911268004.7A CN110813504A (en) | 2019-12-11 | 2019-12-11 | Blast furnace coal injection and pulverization system with drying furnace removed and working method thereof |
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| CN116064982A (en) * | 2023-01-29 | 2023-05-05 | 上海开鸿环保科技有限公司 | Method for recycling waste heat and residual energy of tail gas of coal injection and powder preparation of blast furnace |
| CN116083673A (en) * | 2023-01-29 | 2023-05-09 | 上海开鸿环保科技有限公司 | Synchronous desulfurization and denitrification system for cascade utilization of flue gas of blast furnace hot blast stove |
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